Exercise $5$: Magnetic Fields

Electrically charged particles of equal mass and charge magnitude $($though different sign$)$ are moving through regions of space in which there may be magnetic fields. In each case, shown is the sign of the charge and a portion of the path the charge follows through the region. $($These are top views looking down on charges moving in the plane of the page.$)$ All of the charges enter the regions with the same initial velocity. There are no external electric fields and in answering the below questions you should ignore any fields created by the moving charged particles themselves

In which region $(A-F)$ is the component of the magnetic field out of the page largest?

In which region $(A-F)$ is the component of the magnetic field into the page largest?

In which, if any, of the regions MUST the total B field be zero $(A-F$ or none$)?$